Taylor Swift proved that she's number one on both the pop and country stages. The 21-year-old received Entertainer of the Year honors at the Academy of Country Music Awards in Las Vegas on Sunday night. Miranda Lambert, 27, was the most decorated artist of the night, receiving Female Vocalist of the Year, as well as Song, Single Record and Video of the Year for "The House that Built Me." Nashville trio Lady Antebellum took home Album of the Year honors for their 2010 smash Need You Now.

Hosted by Reba McEntire and Blake Shelton, the 46th annual gathering also boasted some exciting live performances by a diverse pairing of artists. Rihanna took the stage with Sugarland's Jennifer Nettles to debut her new song “California King Bed," while Carrie Underwood and Steven Tyler joined forces on Underwood's own "Undo It," and the Aerosmith classic "Walk This Way." Looks like everyone's a little bit country, and a little bit rock 'n roll. –EMILY EXTON

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